56 



714. Stipa viridula Trin., var. robusta Vasoy, )'. rar, C'nlnis donsfsly tufted, 12 

 ' to If^''"' higli, stout, leafy : lower sheaths loose iind lirotid, loujjjer than the 



internodes; bliulea Hat and wide or involute above, often 0''"' lonj^,-, scabrous: 

 panicle dense and larf^e, erect, 2r> to 40'^'" long: empty glumes 10""" long, 

 three to live nerved, callus short, densely hairy. — Chenatc Mountains (Presidio 

 county). Rauges from Colorado to Mexico. 



7 15. Oryzopsis fimbria ta Vasoy. 



716. Oryzopsis membrauacea Pursh ((). cuspidaia Bonth.). 



717. Oryzopsis micrantha Thurber? 



718. Muhleubergia arenicola Buckley. , 



719. Muhlenbergia Berlaiidieri Trin. 



720. Muhleubergia Buckleyana Seribuer, *;. up. This is M. Tcraua Buckley (Proc. 



Piiila. Acad., 1362), a name antedated by M. Texana Thurber. Poua (Duval 

 county). 



721. Muhlenbergia capillaris Kunth. 



722. Muhlenbergia diffusa Sclireb. 



723. Muhlenbergia distichophylla Kunth. 



724. Muhlenbergia gracilis Trin. 



725. Muhlenbergia gracillima Torr. 



726. Muhlenbergia Lemmoni Scribner, «.sy>. Cnliusmuch branched below, slender, 



erect or decumbent, 30 to 4^^'"' high: leaves 2,5 to 7.5"^ long, 2""" wide, acu- 

 minate: panicle spike-like, r> to 12. ;")"■> long, interrupted below, the upper 

 branches sessile, the lower pedicellcd and subdivided, sometimes 2.5 to 5'^"* 

 long, erect : spikelets about ;i""" long without the awns : empty glumes ovate- 

 lanceolate, awn-pointed, nearly equal and but little shorter than the flower- 

 ing glume, which is hairy below and with an awn half or as long as itself. — 

 Ballinger (Runnels County): also in New Mexico, Arizona, and Mexico. A 

 member of a very variable group, resembling M. aylratica. 



727. Muhlenbergia monticola Buckley. Ballinger (Runnels county). 



728. Muhlenbergia setifolia Vasoy. 



729. Muhlenbergia Texana Thurber. 



730. Muhlenbergia tricholepis Torr. 



731. Muhlenbergia trichopodes Chapman. Ballinger (Rnnnols county). 



732. Muhlenbergia virescens Trin. 



733. Muhlenbergia Wrightii Vasey. 



734. Lycurus phleoides IIBK. • 



735. Alopecurus aristulatus Mi<dix. 



736. Sporobolus airoides Torr. 



737. Sporobolus argutus Kuntli, var. Arkansanus Vasey. Point Isabel. 



738. Sporobolus asper Kunth. Santa Anna (Coleman coTUity). 



739. Sporobolus asper Kunth, var, Hookeri Vasey. Santa Anna (Coleman 



cimuty), 



740. Sporobolus asperifolius Ttiurber. Peua (Duv.al ootuity'). 



741. Sporobolus asperifolius Thurb., vnr. brevifolius Vasey. Pena (Duv.al 



county). 



742. Sporobolus Buckleyi Vasey, Point Isabel. 



743. Sporobolus confusus Vasey (S. ramulonuH of authors). Ijim])ia cafion (Pre- 



sidio county). 



744. Sporobolus cryptandrus Cray. Pena (Duval county) an<l Screw Bean 



(Presidio county). 



745. Sporobolus cryptandrus Gray, var, tlexuosus Thurber, 



746. Sporobolus cryptandrus Cray, var. robustus Vasey, n. var, CJiilms erect, 



to l>'*i" high, stout, simple or witli n. few erect branelies: leaves erect, 

 rigid, scabrons on the margins, 15 to ;{()'"' long, 0""" wiilc, attenuate ; sheaths 

 smooth, except the oil iato margins and hairy ligule; upper sheath long and 



